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Ampacity Tables
Triplexed Conductors
Underground Ducts

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Triplexed conductor cable underground ducts

Three single or triplexed cable
underground ducts

Closed shield operation. Shields bonded and grounded at multiple points. One triplexed cable or three single conductor cables in a duct. All cables equally loaded and in outside ducts only.

Earth ambient temperature 20°C
Earth thermal resistivity RHO 90
100% load factor
Depth of burial - 30” to top of duct bank with ducts on 7 1/2” centers.

 

One circuit — three single or triplexed conductors per duct
Three single or triplexed conductors
Copper - underground ducts		 Three single or triplexed conductors
Aluminum - underground ducts

Conductor
Size
AWG-kcmil

Non-Shielded

Shielded

600-2000 Volts
Ampacity

2001-5000 Volts
Ampacity

5001-35000 Volts
Ampacity

90° C
(194°F)

90° C
(194°F)

105°C
(221°F)

90° C
(194°F)

105°C
(221°F)

8.........
.6.........
4.........
2.........
1.........
1/0.........
2/0.........
3/0.........
4/0.........
250.........
350.........
500.........
750.........
1000........\

64.........
85.........
111.........
146.........
168.........
193.........
220.........
252.........
290.........
319.........
387.........
471.........
585.........
670.........

64...
85...
110...
145...
170...
195...
220...
250...
290...
320...
385...
470...
585...
670...

69...
92...
120...
155...
180...
210...
235...
270...
310...
345...
415...
505...
630...
720...

—...
90...
115...
155...
175...
200...
230...
260...
295...
325...
390...
465...
565...
640...

—...
97...
125...
165...
185...
215...
245...
275...
315...
345...
415...
500...
610...
690...

Non-Shielded

Shielded

600-2000 Volts
Ampacity

2001-5000 Volts
Ampacity

5001-35000 Volts
Ampacity

90° C
(194°F)

90° C
(194°F)

105°C
(221°F)

90° C
(194°F)

105°C
(221°F)

50.........
66.........
86.........
114.........
131.........
150.........
172.........
196.........
226.........
250.........
304.........
372.........
468.........
546.........

50...
66...
86...
115...
130...
150...
170...
195...
225...
250...
305...
370...
470...
545...

54...
71...
93...
125...
140...
160...
185...
210...
245...
270...
325...
400...
505...
590...

—...
70...
91...
120...
135...
155...
175...
200...
230...
250...
305...
370...
455...
525...

—...
75...
98...
130...
145...
165...
190...
215...
245...
270...
330...
400...
490...
565...

 

Three circuits — three single or triplexed conductors per duct
Three single or triplexed conductors
Copper - underground ducts		 Three single or triplexed conductors
Aluminum - underground ducts

Conductor
Size
AWG-kcmil

Non-Shielded

Shielded

600-2000 Volts
Ampacity

2001-5000 Volts
Ampacity

5001-35000 Volts
Ampacity

90° C
(194°F)

90° C
(194°F)

105°C
(221°F)

90° C
(194°F)

105°C
(221°F)

8.........
.6.........
4.........
2.........
1.........
1/0.........
2/0.........
3/0.........
4/0.........
250.........
350.........
500.........
750.........
1000.........

56.........
73.........
95.........
123.........
141.........
161.........
183.........
208.........
237.........
260.........
313.........
376.........
461.........
523.........

56...
73...
95...
125...
140...
160...
185...
210...
235...
260...
315...
375...
460...
525...

60...
79...
100...
130...
150...
175...
195...
225...
255...
280...
335...
405...
495...
565...

—...
77...
99...
130...
145...
165...
185...
210...
240...
260...
310...
370...
440...
495...

—...
83...
105...
135...
155...
175...
200...
225...
255...
280...
330...
395...
475...
535...

Non-Shielded

Shielded

600-2000 Volts
Ampacity

2001-5000 Volts
Ampacity

5001-35000 Volts
Ampacity

90° C
(194°F)

90° C
(194°F)

105°C
(221°F)

90° C
(194°F)

105°C
(221°F)

44.........
57.........
74.........
96.........
110.........
126.........
143.........
162.........
185.........
203.........
245.........
297.........
369.........
426.........

44...
57...
74...
96...
110...
125...
145...
160...
185...
205...
245...
295...
370...
425...

47...
61...
80...
105...
120...
135...
155...
175...
200...
220...
265...
320...
395...
460...

—...
60...
77...
100...
110...
125...
145...
165...
185...
200...
245...
290...
355...
405...

—...
65...
83...
105...
120...
140...
155...
175...
200...
220...
260...
315...
385...
440..

 

Six circuits — Three single or triplexed conductors per duct
Three single or triplexed conductors
Copper - underground ducts		 Three single or triplexed conductors
Aluminum - underground ducts

Conductor
Size
AWG-kcmil

Non-Shielded

Shielded

600-2000 Volts
Ampacity

2001-5000 Volts
Ampacity

5001-35000 Volts
Ampacity

90° C
(194°F)

90° C
(194°F)

105°C
(221°F)

90° C
(194°F)

105°C
(221°F)

8.........
.6.........
4.........
2.........
1.........
1/0.........
2/0.........
3/0.........
4/0.........
250.........
350.........
500.........
750.........
1000.........

48.........
62.........
80.........
103.........
117.........
133.........
150.........
170.........
193.........
211.........
252.........
301.........
365.........
412.........

48...
62...
80...
105...
115...
135...
150...
170...
195...
210...
250...
300...
365...
410...

52...
67...
86...
110...
125...
145...
160...
185...
210...
225...
270...
325...
395...
445...

—...
64...
82...
105...
120...
135...
150...
170...
190...
210...
245...
290...
350...
390...

—...
68...
88...
115...
125...
145...
165...
185...
205...
225...
265...
310...
375...
415...

Non-Shielded

Shielded

600-2000 Volts
Ampacity

2001-5000 Volts
Ampacity

5001-35000 Volts
Ampacity

90° C
(194°F)

90° C
(194°F)

105°C
(221°F)

90° C
(194°F)

105°C
(221°F)

38.........
48.........
62.........
80.........
91.........
104.........
117.........
133.........
151.........
165.........
197.........
238.........
292.........
336.........

38...
48...
62...
80...
91...
105...
115...
135...
150...
165...
195...
240...
290...
335...

41...
52...
67...
86...
98...
110...
125...
145...
165...
180...
210...
255...
315...
360...

—...
50...
64...
80...
90...
105...
115...
130...
150...
165...
195...
230...
280...
320...

—...
54...
69...
88...
99...
110...
125...
145...
160...
175...
210...
250...
305...
345...

 

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